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1070 080 067-101 (2001.03) GB
PSI 6XXX.350 L1
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The robot sets the <Start> input signal and simultaneously closes the weld
gun.
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For the specified period, the pressure is measured at intervals of 10 ms and
the values obtained are saved. The specified period equals the pre-
squeeze time plus the squeeze time plus 500 ms as configured in the pro-
gram assigned to the selected spot. However, the maximum measuring
time is 2 sec. When the specified period has elapsed, the <Operate> signal
is reset.
During the sequence of the program, the pressure is measured every 10 ms and the ob-
tained values are saved. Measurements are taken until the end of the <Hold Time>, or
for 2 seconds at the most. Consequently, 200 measured pressure values are recorded.
These measures are queried from the last one up. The point in time where a deviation of
more than -10% from the command value is found is defined as the beginning of the
<Time to pressure>. The <Final value of output pressure> is then defined as the
mean of the measured values from the end up to the <Time to pressure>. If the desired
pressure is not reached, an error message is transmitted, just like if the <Time to pres-
sure> is too long or to short. The lower time limit is the pre-squeeze time, the upper time
limit is the pre-squeeze time plus the squeeze time minus the pressure check before the
end of squeeze time.
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Upon correct completion of the pressure calibration process, the <Pres-
sure calibration/check finished> signal becomes high and is held until the
<Pressure check> input signal is reset.
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The robot must reset the <Start> signal.
You can view the results of the last checking of the respective electrode in the "Scaling
Results" window under "Electrode Setup" in the BOS.
After each pressure check, the pressure profile together with the date, time program
number, time to pressure and final value of output pressure are written to a log file and can
be saved in the BOS. An independent Bosch program is available for the visual display of
these pressure profiles.
If an error occurs:
The notes under "Current Scaling" apply correspondingly.
Electrical connection
7-35
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